For movies and long form videos, yes. When I watch a movie, I don't want to wait, risk buffering, get less quality, or go over my quota, so pre-loading it is the way to go for me.
For short form videos, at least for me, it doesn't matter anymore. In my region, the carriers often offers promos and bonuses on data plans that I usually don't bother "restricting" myself from streaming short form contents.